Hi Don,
Thanks for the quick response. A few followup questions:
It looks like MapTileLayer is new to OM5. Does OM 4.6.5 have the ability
to display tiles like this?
I downloaded GDAL from gisinternals.com (it provides native Windows
binaries). I ran "gdal_translate --formats", and I don't see an option to
translate into either the OpenStreetMap tiles or Google tiles. Is there an
extension that provides this functionality? Sorry for asking a non-OpenMap
question.
Thanks again,
Greg
On Mon, Jun 18, 2012 at 9:42 PM, Don Dietrick <dfdietrick_at_gmail.com> wrote:
> Hi Greg,
>
> To be honest, when I get a very large image file I want to display, I
> use GDAL to create image tiles out of it (Like Google
> Tiles/OpenStreetMap tiles) and then use the MapTileLayer to display
> it. GDAL will merge files to let you create a large area tile set,
> too. GDAL has a command line script that you point at an image (or
> set of images) and tell it where to put the tiles, and you're done.
>
> If you use GDAL to create tile sets, you have to set the MapTileLayer
> with a com.bbn.openmap.dataAccess.mapTile.TMSMapTileCoordinateTransform
> so it knows how the tiles are laid out (the y tile coords are opposite
> of OSM tiles).
>
> The MapTileLayer takes properties about the tile set so it knows how
> to display it. You can keep the properties in a tiles.omp file
> underneath the tile set root directory, or set the properties on the
> layer itself. The javadocs for MapTileLayer have more information.
>
> JAI is probably the best bet when handling images of this size, but as
> you've noted, it doesn't really handle really large images very well.
>
> - Don
>
> On Mon, Jun 18, 2012 at 7:29 PM, Greg Jewell <greg17_at_jewell.net> wrote:
> > Hello,
> >
> > Has anybody had any experience trying to get OpenMap to load very large
> > GeoTIFF files? I am able to display an image that is about 35MB in
> > size, but it takes a significantly long time to load. (Our normal
> > environment doesn't utilize JAI native libraries, but even with the
> > libraries it's still pretty slow.)
> >
> > We were recently given several files that range in size from 700MB to
> > 3.3 GB. With the maximum VM heap size set to 1GB, I get our of memory
> > errors even on the 700MB file. Setting it higher will prevent the out
> > of memory errors, but the imagery doesn't display. Changing the tile
> > cache size hasn't had any apparent effect, either.
> >
> > My environment is Windows XP 32 bit, Windows 7 64 bit (with the 32 bit
> > JVM), and OpenMap 4.6.5. Does OpenMap 5 use something other than JAI to
> > process GeoTIFF images? JAI development is dead, I'm afraid, and it
> > seems to really struggle with larger images.
> >
> > As far as I am aware, the imagery is valid and uncorrupted -- PhotoShop
> > loads it "just fine".
> >
> >
> > Thanks,
> > Greg Jewell
> >
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Received on Tue Jun 19 2012 - 09:21:17 EDT